usb: dwc3: Adjust TX FIFO allocation

Optimize the dwc3_gadget_resize_tx_fifos() function to better
allocate the per-endpoint FIFOs depending on a number of factors:

- super- or non-super speed
- bulk/isoc with bursting
- reduced RAM (when QDSS uses some internal RAM)
- endpoint enabled in composition

Change-Id: I0d64b01f347614feaf8dac60d8d0b91ed8987083
Signed-off-by: Jack Pham <jackp@codeaurora.org>
Signed-off-by: Mayank Rana <mrana@codeaurora.org>